For small and medium-sized enterprises has branches in all over, with the method of VOIP to improve their own internal communication network, can not only make full use of existing communications network, also can greatly save the enterprise spending on communication cost, VOIP Gateway12xx, 15 xx voice gateway, cooperate with VOIP ePhone 20 x series of IP phone, perfect connection VOIP communication network and the enterprise existing PSTN network,


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